Encapsulated pan base and greenhouse: what they have in common

1. Step 1. Encapsulated pan base — is part of — Saucepan. A multi-layer base spreads the heat.
2. Step 2. Saucepan — is made of — Bronze. Ancient cauldrons were bronze and copper.
3. Step 3. Bronze — uses — Casting. Bronze objects were cast in moulds.
4. Step 4. Casting — is used in — Window glass. The panes were cast in moulds.
5. Step 5. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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